Azerbaijan's Central Electoral Commission has annulled the results of the November 6 parliamentary elections in a fourth district, citing violations in balloting procedures.

The commission cited improper ballot counting and police interference with the voting in a district in Gyanja, about 300 kilometers west of the capital, Baku, as grounds for its action. Last week the commission overturned results in three other districts. In all four cases authorities had originally declared candidates of President Ilham Aliyev's New Azerbaijan Party as the victor.

Overall results of the vote show the governing party still in control of parliament.

Opposition parties insist the vote was rigged and are demanding new elections.

About 20,000 protesters demonstrated in Baku Sunday challenging the elections.

Monitors from the Organization for Security and Cooperation in Europe say the balloting failed to meet international standards.